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Fix for fp_copy() when used with ALT_ECC_SIZE so any excess digits on the destination that we didn't write to are set to zero.

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This commit is contained in:
David Garske
2016-05-04 23:15:38 -07:00
parent 9001036e09
commit 7c3fbd7644
1 changed files with 8 additions and 1 deletions
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9
wolfcrypt/src/tfm.c
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@ -2177,13 +2177,20 @@ int mp_div_2d(fp_int* a, int b, fp_int* c, fp_int* d)
}
#ifdef ALT_ECC_SIZE
void fp_copy(fp_int *a, fp_int* b)
void fp_copy(fp_int *a, fp_int *b)
{
if (a != b && b->size >= a->used) {
int x, oldused;
oldused = b->used;
b->used = a->used;
b->sign = a->sign;
XMEMCPY(b->dp, a->dp, a->used * sizeof(fp_digit));
/* zero any excess digits on the destination that we didn't write to */
for (x = b->used; x < oldused; x++) {
b->dp[x] = 0;
}
}
}